I've d/led, installed, and updated the Virtual PC, WinXP Mode from Microsoft. But I need it to run in, or at least be able to be switched to, 800x600 rez when run in full-screen. I can't seem to change the rez while in it, though. This is its rez when I run it on my Win7 Pro, 64-bit system, and it won't let me move the slider-switch: